Preheat oven to 350 degrees F (180 degrees C).
In a large bowl, add All-Purpose Flour (3/4 cup), Baking Powder (1 teaspoon), Unsweetened Cocoa Powder (2 tablespoon), Salt (1/2 teaspoon). Mix well and set aside.
In another bowl, add Butter (4 tablespoon) and Dark Chocolate (2 cup). Heat in the Panasonic Microwave Oven for 1 minute. Stir until combined.
Add Granulated Sugar (1 1/2 cup), Brown Sugar (1/2 cup), and Egg (3). Mix until well combined.
Add the flour mixture into the chocolate mixture. Stir well.
Pour half of the batter into a cake tin lined with baking paper. Place enough Kit Kat® Crisp Wafers in Milk Chocolate (16 piece) to fill the tin.
Pour the remaining batter on top and smooth it out, then place into the preheated oven and bake for 30-35 minutes.
Cut into bars or squares. Enjoy! Cooking results may vary depending on microwave oven used.